procedures

banque.tables.md

@@ -97,7 +97,7 @@ create table exchange_rate (
 create table account (
   "id" bigint primary key generated always as identity,
   "opened_at" date not null default current_date,
-  "balance" numeric(18,6) not null default 0,
+  "balance" decimal not null default 0 check (balance >= 0),
   "currency_code" text not null references currency (code)
 );
 ```